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      a couple of people that are standing in the grass: Ldu mekongdelta21? Provided by Ozy Media, Inc. Ldu mekongdelta21

      As American bombs rained down on the flooded rice fields of the Mekong River?Delta, an adolescent?Duong Van?Ni would submerge himself in the water to avoid detection, breathing through a lotus stem. “That’s how I survived,” Ni says.?“I want to teach people that the environment is our friend and will always help us if we protect it.”

      Now, far removed from surviving on a bowl of rice a day during the American war in Vietnam, Ni is?a respected professor of ecological and environmental studies at Can Tho University. Every month, Ni, 63, teaches 10 days and spends the rest of the time on field trips across the Mekong Delta. He visits three to four families a day to discuss solutions tailored to specific environmental challenges.

      a group of people standing in the grass: Dr van ni16 copy? Provided by Ozy Media, Inc. Dr van ni16 copy

      The Mekong Delta, home to 20 million people, is one of the most productive agricultural environments in the world and supports two to three rice harvests a year. One-third of Vietnam’s gross domestic product, more than half of its?rice production and 95 percent of its exports, which help feed 200 million people in the region, are generated in the delta.

      An upsurge in global temperatures that cause rising sea levels and more extreme climatic events poses an acute threat to the future of Vietnam’s rice basket. Salinization has always been part of this ecosystem, but in recent years its levels have become unpredictable. In January 2016, the region experienced the worst drought in a century. Due to the resulting lack of fresh water, half of the 5.4 million acres of arable land in the delta — an area larger than Lebanon?— was affected by an influx of salt water that contaminated drinking water and destroyed crops.

      a man standing next to a river: Ldu mekongdelta71? Provided by Ozy Media, Inc. Ldu mekongdelta71

      For the past 40 years, Ni has documented these changes in small notebooks. A decade ago, he developed a $4 hand-held plastic device, unique in its simplicity, that allows farmers to test salinity in the water before it reaches their rice paddies. Thousands of families are using it. They relay their findings by text message (Ni provides cheap phones?to those who don’t have them) to a central database at the university, which informs other farmers in the area of salinization levels. If the salt content exceeds more than 4 grams per liter, the rice will perish. The data is used to warn farmers of encroaching salt so they can switch to shrimp or reed farming in time. (The common reed can be dried and sold as mats or roofing.)

      In a country traumatized by decades of war and famine, food security has long been synonymous with intensive rice production. Ni thinks it’s time to abandon the monoculture strategy. “We need to diversify crops, reduce the use of chemical products and save water resources,” he says.

      a boat parked on the side of Tonlé Sap: Ldu mekongdelta68? Provided by Ozy Media, Inc. Ldu mekongdelta68

      These days, Ni is teaching farmers to train one another, and he’s training young scientists from 22 universities and managers of 12 endangered wetland sites who can pass their knowledge along to villagers back home. “I can do salinity maps for international conferences, but what use is that?” Ni says. “I do not teach people science. I teach them to survive.”

      On country trails, people get off their bikes to greet the short man they call “Teacher.”?Ni has no enemies to speak of, but his direct pro-poor approach is certainly watched. Whenever he takes an outsider on a field trip, the not-so-discreet secret police follow him, usually men on motorbikes sitting next to or circling the homes of interviewees, recording every conversation. It’s dangerous to challenge the authoritarian one-party government policy of development at all costs. Critics are labeled “anti-national” and risk being jailed.

      a group of people in a room: Ldu mekongdelta11? Provided by Ozy Media, Inc. Ldu mekongdelta11 a man standing next to a river: Ldu mekongdelta14? Provided by Ozy Media, Inc. Ldu mekongdelta14

      That didn’t stop Ly Van Loi from founding the Mekong Delta Youth group, which offers workshops on modern environmental solutions. For the past four years, Loi has been assisting Ni. “He taught me to always prioritize the benefits for the community,” Loi says. “To have a chance to adapt to the environmental changes, we need to make advanced technologies available to decision-makers while offering simple tools to local people.”?

      A 2018 study?by the Mekong River Commission (MRC) found that 97 percent of sediment flow to the delta — which is crucial to fertility — will be lost by 2040, if all planned dam projects on the Mekong and its tributaries proceed. Combined with coastal erosion due to rising sea levels, 1,200 acres of land disappear every year. A recent study?by Utrecht University in the Netherlands suggests that unless drastic action is taken, most of the delta will be submerged by the end of the century. Independent researcher Nguyen Huu Thien raised the alarm in a damning 2010 report for the MRC?he co-wrote, foretelling a devastated delta.

      Ldu mekongdelta12 47? Provided by Ozy Media, Inc. Ldu mekongdelta12 47
      a man standing next to a tree: Ldu mekongdelta30? Provided by Ozy Media, Inc. Ldu mekongdelta30

      “Professor Ni’s work engaging local farmers in a community-based salinity monitoring system is very useful,” Thien says. “But we also need solutions at the strategic and policy level … Adaptation does not necessarily mean fighting the changes at all costs in order to maintain the status quo.”

      In 2013, the government adopted the Mekong Delta Plan, a scheme to save the region’s economy by building freshwater and grain dikes and reservoirs, digging canals and elevating houses. A 2017 addendum?set out a new direction: to avoid aggressive interventions into nature, to focus the delta’s agriculture on quality rather than quantity and to take the interests of all sectors —?services, ecological tourism and agro-industry — into consideration. Ni is pleased with the changes. “Trying to plant paddy rice in inappropriate zones and using ‘integrated planning’ as a tool for future development, as we did in the past, will lead to disaster,” he says.

      a tree in a park: Ldu mekongdelta18? Provided by Ozy Media, Inc. Ldu mekongdelta18

      After small-scale chicken farming was almost totally wiped out because of cheaper factory-reared chicken, many in the Mekong Delta?turned to duck farming like farmer?Ho The Kieu.?

      In 2008, Ni and his colleagues founded the Dragon Institute, a reference to the local name of the Mekong — C?u Long (Nine Dragons), representing the river’s nine branches. Its aim is to create a global observation network, with eight other delta research centers to be established for the Mississippi in the United States, the Nile in Egypt, the Pearl River in China, the Ganges-Brahmaputra in India/Bangladesh, the Danube in Ukraine/Romania, the Amazon in Brazil and the Irrawaddy in Myanmar.

      It’s about more than climate change: These regions are battling poverty, migration and development.?“Deltas are like children,” Ni says. “They need many things, and they are very fragile. We need to take care of them carefully because everything we do will impact them for many years to come. The best way for children to grow up is through sustainability and adaptability.”

      Ldu mekongdelta42? Provided by Ozy Media, Inc. Ldu mekongdelta42

      OZY’s 5 Questions With?Duong Van?Ni?

      • What is your dream??Building a Mekong Natural History Museum in the delta and gathering the stories of the people who live there.?
      • What do you worry about??The loss of local cultures.?
      • What’s the one thing you can’t live without??The Mekong Delta and its people.?
      • Who’s your hero??My mother!
      • What’s your motto??Think global, act local.

      Read more: Can he convince tuk-tuk drivers to go green?

      a screenshot of a cell phone: Mekong? Provided by Ozy Media, Inc. Mekong
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